Economic Community of West African States, ECOWAS,African Union
18-03-2022
Work Detail
Request For Proposals Are Invited For Drilling Of Borehole Installation Of Submersible Pump And Solar System In Sukwan Community Gereng Ward Girei Lga Adamawa State Description Unit Qty Rate Amount Site Clearing And Mobilization Mobilization Of Drilling Rigs And Necessary Tools Equipment And Machines To Site Item 1 Drilling Using 8 Inch Diameter Bit With Percussion Or Rotary Drill Method By Using Appropriate Rigs Cutter Pipes Machine And Other Equipment Capable Of Drilling Up To A Depth Up To 80 Meters Depending On The Availability Of Appropriate Soil Layer Through All Sorts Of Strata Protection Of Caving By Supplying Necessary Casing Pipe Collection Of Soil Samples At Every Change Of Strata And Preserve Them For Analysis Withdrawal Of Boring Casing Pipes Etc M 100 Casing Provide And Install 150Mm Diameter Internal Casing Upvc Not Less Than 15Bars Panar Or Equivalent Type As Per Specification N0 35 Provide And Install 150Mm Diameter Screen Upvc Not Less Than 15 Bars Panar Or Equivalent Slot Size 0 5 1 0Mm Factory Slotted Provision Of Suitable Gravel Pack To Fill The Annular Space Between The Sides Of The Borehole And The Screen The Gravel Pack Grain Sizes Are To Be Defined By The Grain Size Of The Aquifer And Can Ranged From 2 4Mm In Diameter Reasonably Homogenous Calibrated Clean From Debris Round And Preferably Siliceous Available From Riverbed Free From Soil And Other Materials Including Supply Delivery Casting And Cleaning Enough Gravel Pack Shall Be Installed To Completely Cover The Uppermost Screen And Yonder By An Additional 2 Metres To Allow For Settling A Good Supply Of Water Should Be Introduced With The Gravel To Prevent Bridging The Gravel Pack Shall Be Capped With A 2 Metre Vertical Column Of Clay Seal To Prevent Any Seepage That May Contaminate Aquifers With Subsequent Pollution Of Ground Water Ls 1 Grouting Grouting With Clay Or With A Mixture Of Bentonite And Cement The First Clay Grout Of 2 Meters Length Must Be Placed On Top Of The Gravel Pack To Stop The Grout From Plugging The Gravel Pack Including Supply Delivery Fitting And Fixing Clay Back Filling For The Intermediate Space Between The Clay Plug And The Concrete Plug Fill Up With Sand And Clay The Last 2 Meters Should Be Filled Up With A Mixture Of Water And Cement Grout Up To The Ground Level The Procedure Involves Filling The Annular Space Up To The Ground Level And Then Leaving To Set For A Minimum Of 12 Hours Before Starting Further Development All Costs Including Supply Delivery Casting And Cleaning M 10 Borehole Development The Service Provider Shall Carry Out Development And Cleaning Of Borehole By Airlifting And Air Jetting Methods Upon Completion Of Installation Of Casing And Gravel Pack This Shall Be Done To Remove Silts Clays And Fluid Residues Deposited On The Borehole Wall And Adjacent Portions Of The Aquifer During The Rehabilitation Process The Service Provider Should Make Arrangement Of Water Level Measuring Kits Including Transportation Of Air Compressor Unit To Site For The Purpose Of Air Compressor Of Evaluation 24 Hrs Is Considered Item 1 Test Pumping Establish Borehole Parameters By Test Pumping The Borehole For 12 Hours And Provide Borehole Data Such As Yield Drawdown The Following Elements Will Be Contained In The Test Pumping A A Period Of Recovery After Production Pumping Development Item 1 Tender Package Request For Proposal Rfp Nig Yol Ten23 B A Pre Test Calibration Typically 2 To 3 Hours C A Period Of Recovery After Pre Test D A Step Draw Down Test Typically Five Steps Each Of 2 Hours Duration Total 10 Hours E A Period Of Recovery After Step Draw Down TestWater Quality Test A Minimum Of 2 Litres Each For Chemical And Bacteriological Analysis Shall Be Collected By The Contractor In The Presence Of The Engineer Or His Representative 3 Water Samples Should Be Collected In Clean Sterilized Properly Sealed And Protected Plastic Containers From The Borehole For Reference To A Water Testing Authority Recognized And Authorized By Mercy Corps For Laboratory Analysis After Completion Of Test Pumping One Sample Will Be Used For Each Of These Tests Physical Chemical And Bacteriological Analyses The Samples So Collected Should Reach The Authorized Water Testing Laboratories Ministry Of Water Resources And National Agency For Food And Drug Law And Control Nafdac Within 6 Hours From The Time Of Collection From The Borehole Unless Otherwise Specific Parameters To Be Measured Shall Include Physical Parameters Colour Odour Taste Turbidity Ph Value Electrical Conductivity Temperature Chemical Parameters Nitrate Nitrite Total Hardness Fluoride Chloride Sulphate Copper Manganese Tds Total Iron Arsenic Biological Parameters Faecal Coli Form Counts No 1 Borehole Completion Report A Full Borehole Completion Report Shall Be Prepared By The Service Provided And Submitted To The Mercy Corps Within Ten Days Of The Completion Of The Pumping Tests The Borehole Completion Report Shall Include The Following A A Borehole Log Showing Borehole Location Ground Surface Elevation Measuring Point Elevation Soil Strata Static Water Level And Dimensions Of Casing Screen Grounding And Cap B Pumping Tests Reports C Result Of Analysis Of Water D All Other Records As Specified Report 1 Borehole Cleaning And Disinfection Provide For The Disinfection Of Well By Introducing Granular Calcium Hypochlorite Or Sodium Hypochlorite Into The Annular Space Along With The Gravel Pack Material At A Concentration Of 500Grammes Per Cubic Meter Of Pack To Provide An Effective Seal To The Entry Of Contaminants Up To 3 0 Metres Depth Of The Borehole From The Surface Shall Be Grouted Using Cement Slurry 1 85 2 15 Kg Liter For Sanitary Seal And Well Head Construction The Top Of The Casing Shall Be A Minimum Of 0 5M Above The Original Ground Level And There Shall Be A Flange For Connection Of The Wellhead Assembly The Conductor Pipe Surface Casing Around The Inner Casing Shall Be Raised At Least 30 Cm Above The Inner Casing And Then Capped Properly By Welding 6Mm Thick 8 Inch Steel Plate To Secure The Well Around The Casing There Shall Be A 1 5M X 1 5M X 1M Concrete Slab Submit Offers To For Hard Copy Submission Proposal Subject Nig Yol Ten23 The Drilling Of Borehole Installation Of Submersible Pump And Solar System In Sukwan Community Gereng Ward Girei Lga Adamawa State At Mercy Corps Office 10A Suntai Road Karewa Extension Jimeta Yola Adamawa State For E Submissions Email Offer To Tenders Mercycorps Org With The Email Title Nig Yol Ten23 The Drilling Of Borehole Installation Of Submersible Pump And Solar System In Sukwan Community Gereng Ward Girei Lga
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